This is easier if you draw it out. You go left to right on the carbon chain. Branches off of the main carbon chain can be indicated with a parentheses.
example: propan-2-ol condensed formula can be CH3CH(OH)CH3.
Dont forget the triple bond for your heptyne.
What is the condensed formula for 6-chloro-2-methyl-3-heptyne?
1 answer